Which database does Facebook & Google use ?

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Facebook has moved to a NoSQL database named HBase. Google uses their own system called BigTable. What is NoSQL ? NoSQL is a term used to designate databases which differ from classic relational databases. NoSQL database management systems are useful when working with a huge quantity of data when the data's nature does not require a relational model. The data can be structured, but NoSQL is used when what really matters is the ability to store and retrieve great quantities of data, not the relationships between the elements.
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How to delete your yahoo account?

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To cancel your Yahoo account, go here: https://edit.yahoo.com/config/delete_use…
Then do the following:
-Login with your current username and password
-Select which account that you want to delete
-Enter in your password once again for verification purposes
-Enter in the anti-spam code; this is to prevent automated submissions
-Click Terminate This Account to finish off this process.

You can never open your account back up again because of security reasons. By terminating your Yahoo account, you will permanently lose access to it. Everything stored in your account will be lost during that process.

All this includes:
-Mail
-Address Book
-Answers (your posted content will remain permanently archived)
-Messenger
-My Yahoo!
-Groups
-Alerts
-Flickr
-Any other area that is accessible with your username and password

The only other alternative is to let your account lapse after 6 months of inactivity, plus 2 months for each year you have been an member.

Here is the link you can use to access your other account settings aswell :-
http://help.yahoo.com/l/us/yahoo/edit/ch…

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